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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6918f125aa7e2c80144e28f03efad94f6001aac43e848e87aba5b4b8bf7a66c' 
  AND token = 'YfbA62ZGzwf04aBrhpFsNzps7YPnV/yzaQ168pC25cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}